Steam-boiler.



G. H. POX.

STEAM BOILER.

APPLICATION FILED APR. 25, 1907.

Patented Mar. 29, 1910.

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' predetermined area; to sacrifice steam room connections from theCHARLES H. FOX, OF CINCINNATI, OHIO.

STEAM-BOILER.

Specification of Letters Patent.

Patented Mar. 29, 1910.

Application filed April 25, 1907. Serial No. 370.178.

To all whom it may concern:

Be it known that I, CHARLES H. Fox, a citizen of the United States,residing at Cincinnati, Ohio, have invented a new and useful Improvementin Steam-Boilers, of which the following is a specification.

My invention relates to steam boilers adapted to generate steam for fireen 'incs or other purposes, and the objects of my improvement are tosecure the utmost amount of generating capacity within a for increasedgenerating capacity; to provide an. annular water and steam chamberwhich is approximately of the same width as the diameter of thegenerating tubes; to connect each unit of circulation independently withthe water and steam chambers; to provide the top headers with dischargepipes to the steam chamber through the outer wall of the shell; toprovide the steam chamber with a supplemental apartment; to position thesteam discharge pipe at a point farthest removed from the overflowgenerating units; to protect the top of the shell and the dischargeconnections with a hot air jacket; and to provide a simple and durableconstruction with parts easily accessible for removal or replacing.These objects are attained in the following described manner asillustrated in the accompanying drawings, in which Figure 1 is avertical section on the line a-a of Figs. 2 and 3 of portions of a steamboiler embodying my improvements; Fig. 2 a plan of the top connectionswith the shell; Fig. 3 an inverted section on the line 6-6 of Fig. 1,and Fig. l "a front elevation with parts broken away.

In the drawings the straight cylinders 1 and 2 form the concentric wallsof the shell which is provided on opposite sides with the furnace door 3and the steam discharge pipe 4. The narrow annular steam and water spacebetween the walls is approximately of the same width as the diameter ofone of the water tubes 5. A horizontal partition 6 separates the steamspace into a main chamber 7 and a supplemental chamber 8 thereover. Aassage 9 extends from the main chamber to the discharge pipe near the 1top ring 11, and a similar passage 12 extending between the main and thesupplemental steam chambers terminatcs a short l distance above thevariable water line 13 l and directly over the door 3, as shown bydotted lines in Fig. 1.

A header bar 14 is suspended within the top of the shell in yokes 15 anda series of parallel top headers 16 are secured at one end to itsopposite sides by means of bolts 17. 'Bottom headers 18 similar to andin registration with the respective top headers are connected thereto bya multiplicity of the straight vertical water tubes 5. Each bottomheader is independently connected to the inner wall of the water leg bymeans of a supply pipe 21. and each top header is provided with adischarge pipe 22 which extends over the top of the shell and by a return bend therein communicates through the outer wall of the shell withthe supplemental steam chamber.

Corresponding top and bottom headers together with their connectingwater tubes discharge and supply pipes form separate and distinct unitsof circulation between the water and steam spaces of the shell. llach ofsaid units may be independently removed or replaced without disturbingthe others and accessibility of the connection of the discharge pipcs 22with the outer wall of the shell facilitates their removal.v

An annular flange 23 encircles the shell below the connection of thedischarge pipes 22 therewith and the hood 2st which converges to thechimney (not shown) is formed with straight cylindrical walls 25 wherebyit is removably supported on said flange. Said wall encircles the upperportion of the shell and forms a hot air chamber or jacket 26 whichincloses the terminals of the discharge pipes 22 and maintains them at ahigh degree of temperature with the overflow heat from the inside of theshell. Said air chamber 26 serves also to mutile the exhaust of theengine through the chimney and to modify any sudden change in thetemperature of the top of the shell which tends to loosen the rivets orother connections therewith.

In operation, by reason of the narrow water and steam space, more areais pro vided for the generating units for the same diameter of shell.The discharge from said units to the interior of the supplemental steamchamber is advantageously against the greater heat of the inner wall.The heat of the outer wall supplements that of the inner wall inmaintaining the contents of the supplemental steam chamber at a highdegree vertical shell consisting of concentric cylindrical wallsinclosing an annular water and steam space of uniform thickness, and amultiplicity of vertical water tubes inclosed within the shell inparallel series and each having a diameter substantially equal to thethickness of said annular space.

2. In a steam boiler, a shell provided on one side near its top with adischarge pipe and on the opposite side with a furnace door, said shellconsisting of concentric walls confining between them the water leg andsteam chamber, a horizontal partition in the steam chamber, a passageextending from beneath said partition to the discharge pipe and asimilar passage extending from above said partition toward the water legand terminating a short distance therefrom.

3. In a steam boiler, an annular steam chamber, a similar annularsupplemental steam chamber thereover, an open passage between them, anda steam discharge pipe communicating with the annular chamber.

41. In a steam boiler, a shell consisting of concentric walls inclosingbetween them a water leg and a steam chamber of uniform' thickness, aseries of parallel generating units within the shell, a supply pipeconnecting each of said units with the water leg, and a discharge pipeconnecting each of said units with the steam chamber through the outerwall of the shell.

5. In a steam boiler, a shell consisting of concentric walls inclosing asteam chamber between them, a series of headers supported within theshell, and a discharge pipe connecting each of said headers with thesteam chamber through the outer wall of the shell and in a directionperpendicular thereto.

6. In a steam boiler, a shell, a top header, a discharge pipe formedwith a return bend and connecting at its ends with the header and withthe outside of the shell in a plane with the header.

7. In a steam boiler, an upright shell, a flange secured to the outsidea short distance below the top thereof and a hood supported on theflange with an air chamber between the hood and the portion of the shellabove the flange.

8. A. steam boiler comprising concentric cylindrical. walls inclosing anannular steam chamber, a steam discharge pipe leading therefrom, ahorizontal partition in said chamber and formed with a plural number ofopenings therethrough, one of said openings being arranged tocommunicate with the steam discharge pipe.

9. In a steam boiler the combination of a shell consisting of concentriccylindrical walls inclosing between them an annular water leg and steamchamber, a horizontal partition in said chamber, a passage extendingthrough the partition to a steam discharge pipe thereover and a passageextending through the partition toward the water leg.

10. In a steam boiler, the combination of a shell consisting ofconcentric cylindrical walls inclosing between them an annular steamchamber, a horizontal partition in. said chamber and provided with anopen passage therethrough, and a passage communicating between the spacebelow the partition and the discharge pipe thereover.

11. In a steam boiler, the combination of a shell consisting ofconcentric walls inclosing an annular water and steam space of uniformthickness between them, a series of water tubes within the shell, andmeans communicating therefrom with the annular space through the outerwall and in a direction perpendicular thereto.

12. In a steam boiler, the combination of a shell consisting ofconcentric walls inclosing between them an annular water and steam spaceof uniform thickness, a jacket inclosing the upper portion of the shellwith an air space which communicates with the interior thereof, a seriesof water tubes within the shell and means communicating therefromthrough the air space and in a perpendicular direction through the outerwall with the annular space.

13. In a steam boiler, the combination of a shell consisting ofconcentric walls inclosing between them a steam chamber and a water legof equal thickness therewith, a series of water tubes within the shell,discharge pipes leading therefrom and discharging in a perpendiculardirection through the outer wall to the interior of the steam chamber,and a jacket inclosing the discharge pipes with an air chamber whichcommunicates with the interior of the shell.

14. A steam boiler comprising a shell formed with concentric wallsinclosing an annular steam chamber and a hood inclosing the upperportion thereof with an annular air space.

I CHAS. H. FOX. lVitnesses MICHAEL G. HEIN'rz, R. S. CARR.

